Hedge-fund billionaire Daniel Loeb — one of the biggest and most feared investors on Wall Street and a vocal backer of same-sex marriage — posted a joke speculating about Hillary Clinton’s sexuality on his personal Facebook page.

“Dear Abby,” he posted May 9. “My husband is a liar and a cheat. He has cheated on me from the beginning, and when I confront him, he denies everything. What’s worse, everyone knows that he cheats on me. It is so humiliating. Also, since he lost his job 14 years ago, he hasn’t even look for a new one. All he does all day is smoke cigars, cruise around and shoot the bull with his buddies, while I have to work to pay the bills. Since our daughter went away to college he doesn’t even pretend to like me, and even hints that I may be a lesbian. What should I do? Signed Clueless.”

“Dear Clueless,” the post continues, “Grow up and dump him. Good grief woman! You don’t need him anymore! You’re running for President of the United States. Act like one.”

The anti-Clinton diatribe wasn’t Loeb’s own joke or words — it appeared to be a right-wing meme that has been circulating online since Clinton’s first run. The same faux “Dear Abby” column was also posted on the Facebook page of actor Kevin Sorbo, best known for his role as Hercules in the TV series “Hercules: The Legendary Journeys.”

The resurfacing of the old attack on the Clintons this cycle — on the page of a prominent billionaire — indicates how ugly attacks could get if Hillary Clinton gets into the uncharted territory of a general election.

Loeb, who bundled money for Barack Obama in 2008 before turning on him and backing former Massachusetts Gov. Mitt Romney in 2012, has shown interest in a few of the GOP candidates this cycle.

Before Chris Christie became embroiled in the Bridgegate scandal, Loeb had publicly touted the New Jersey governor’s leadership style and urged him to run for president. But he’s been silent on Christie since, and has yet to commit publicly to any 2016 candidate.

Former Florida Gov. Jeb Bush, meanwhile, has been courting Loeb for his recently launched campaign. And last year, Bush headlined a benefit gala chaired by Loeb to raise money for Success Academy Charter Schools.

“This widely circulated, old meme ended up on my Facebook page inadvertently and as soon as I was informed of it, I took it down,” Loeb said in a statement. “ As a longstanding public supporter of gay and women’s rights, it does not represent my views.”